Stylus Coupling Mechanism for Tolerance-Resistant Pressure Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electronic pens with mechanical pencil refills face issues due to dimensional and positional errors, leading to a gap between the pen tip and pressure transmitting member, causing the pen tip to be pushed back into the casing when starting to write, which affects usability.
Innovation Solution
A stylus design featuring a tubular casing with a pressure detector and a coupling mechanism that includes an elastic member to maintain the core body's position, preventing it from being pushed back into the casing by transmitting pressure effectively and maintaining the overall length of the core body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a mechanical pencil refill is used as the core body, then the electronic pen can write on paper and be recognized by the position detection sensor, but dimensional and positional errors cause a gap between the pen tip and pressure transmitting member, leading to the pen tip being pushed back into the casing
Solution Approach 1:
The patent applies preliminary action by pre-positioning the pressure transmitting member relative to the pen tip using a fixing structure. The pressure transmitting member is held at a predetermined position before writing occurs, ensuring that even with manufacturing tolerances, the pen tip maintains proper contact without being pushed back into the casing during use.
2Ease of operation
If the knock member pushes the core body to extend the writing core, then the writing core can be extended from the pen tip, but the push may apply pressure to the pen pressure detector, affecting pressure detection accuracy
Solution Approach 1:
The patent applies segmentation by dividing the pushing function and pressure transmission function into separate structural paths. The knock member pushes the core body through one path for extension, while the pressure transmitting member is positioned and fixed separately to transmit only writing pressure to the detector, preventing the extension push from affecting pressure detection accuracy.
3Ease of manufacture
If tolerances and positional errors are present in the assembly, then manufacturing is easier and cost-effective, but the pen tip may be pushed back into the casing when starting to write
Solution Approach 1:
The patent applies the intermediary principle by introducing a fixing structure as a mediator between the pressure transmitting member and the casing. This intermediary component compensates for assembly tolerances and positional errors, ensuring that the pen tip remains stable and is not pushed back into the casing during writing, while still allowing for ease of manufacture with standard tolerances.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution ensures that the pen tip remains extended without gaps, enhancing user experience by maintaining the core body's length and preventing it from being pushed back into the casing during writing, even when tolerances and errors are present.
Implementation Method 1
an elastic member disposed in the receptacle, the elastic member biasing the other end of the presser within the receptacle resiliently toward the axial opening defined in the tubular casing
Data Source
AI summary
A stylus includes in a tubular casing a core body, a pressure detector that detects a pressure applied to the core body, a coupling fitted over the core body, the coupling transmitting the pressure to the pressure detector, and a core pressing controller that controls the coupling to press the core body axially in the tubular casing. The coupling includes a push bearer that bears a push from the core pressing controller, a presser having an axial end fitted in the pressure detector, a fitting region fitted over a portion of the core body remote from a pen tip end of the tubular casing, a receptacle in which another end of the presser remote from an axial end thereof is axially movably housed, and an elastic member disposed in the receptacle, the elastic member biasing the other end of the presser resiliently toward an axial pen tip end of the receptacle.